CN110053581B

CN110053581B - Safety belt buckle for a vehicle safety belt system and vehicle

Info

Publication number: CN110053581B
Application number: CN201810051488.9A
Authority: CN
Inventors: ***
Original assignee: TRW Automotive Technologies Shanghai Co Ltd
Current assignee: ZF Automotive Technologies Shanghai Co Ltd
Priority date: 2018-01-19
Filing date: 2018-01-19
Publication date: 2022-09-13
Anticipated expiration: 2038-01-19
Also published as: WO2019141047A1; CN110053581A

Abstract

The invention relates to a belt buckle for a vehicle safety belt system, comprising a buckle head and a housing. The safety belt lock catch also comprises a delivery device which enables the lock catch head to move, the delivery device comprises a lock catch connecting piece connected with the lock catch head, a switching mechanism which enables the lock catch head to be switched between a locking state and an unlocking state, a rack connected with the lock catch connecting piece and a motor which is in action connection with the rack, and the motor is configured to enable the rack to move linearly so as to drive the lock catch connecting piece to move together with the lock catch head. The switching mechanism has a pressing member provided on the latch connector, a guide member provided on the housing and configured to be moved by the latch connector together with the pressing member, a sliding member rotatably and movably fitted on the latch connector, and a pre-tightening member configured to pre-tighten the sliding member toward the guide member. The invention also relates to a vehicle having such a belt buckle.

Description

Safety belt buckle for a vehicle safety belt system and vehicle

Technical Field

The invention relates to a belt buckle for a vehicle safety belt system and to a vehicle having such a belt buckle.

Background

From the prior art, so-called belt buckle deliverers are known which are able to move a belt buckle from a normal position into a delivery position, so that the belt buckle can be easily reached by a passenger, facilitating the fastening of the belt by the passenger. After the passenger fastens the seat belt, the seat belt buckle deliverer returns the seat belt buckle from the delivery position to the normal position again. Such seatbelt buckle deliverers are referred to, for example, patent documents CN104718112B, WO2016/110309 and DE102015016469a 1.

The belt buckle presenter should be as compact and inexpensive as possible, while at the same time it should be ensured that the belt buckle cannot be pulled out of the normal position in the event of a high force acting on the belt buckle, for example in the event of an accident.

Disclosure of Invention

The object of the invention is to provide a belt buckle and a vehicle having such a belt buckle, which can deliver a belt buckle head to a user and at the same time can reliably lock the buckle head.

A first aspect of the invention relates to a belt buckle for a vehicle belt system. The seatbelt buckle includes a buckle head and a housing that is retained in the vehicle. The belt buckle further comprises a delivery device for moving the buckle head in a delivery direction and a retraction direction, the delivery device comprising a cylindrical buckle connection member connected to the buckle head, a switching mechanism for switching the buckle head between a locked state and an unlocked state, a rack connected to the buckle connection member, and a motor operatively connected to the rack, the motor being configured to move the rack linearly so as to be able to drive the buckle connection member together with the buckle head in the delivery direction and the retraction direction. The switching mechanism has a push-down part provided on the latch link, a guide part provided on the housing and configured to be movable by the latch link together with the push-down part, a plurality of first runners and a plurality of first projecting ribs alternately provided in a circumferential direction of the guide part and having first teeth respectively on ends near the latch link, a plurality of second runners and a plurality of second projecting ribs alternately provided in a circumferential direction of the latch part and having second teeth respectively on ends near the guide part, and a pre-tightening part fitted over the latch link so as to be rotatable about an axis of the latch link and movable along the axis of the latch link, the pretensioning element is designed to pretension the sliding element against the guide element. The hold-down element is designed to interact with the prestressing element in such a way that the locking head can be switched between a locked state, in which the second toothing engages with the corresponding first toothing under the effect of the prestressing element, and an unlocked state, in which the second projection rib can slide in the corresponding first slideway and at the same time the second slideway can be slid over by the corresponding first projection rib.

The safety belt buckle according to the invention makes it possible to deliver and retract the buckle head and at the same time to reliably lock the buckle head with the same mechanism.

In a further development of the belt buckle according to the invention, the switching mechanism can be designed to switch the buckle head from the locked state into the unlocked state by: the pressing component moves towards the sliding component under the action of the rack driven by the motor until the pressing component is contacted with the second tooth part, so that the sliding component is driven to move away from the guide component until the first critical point of the guide component is crossed by the second tooth part of the sliding component or the first critical point of the sliding component is crossed by the first tooth part of the guide component, and the second protruding rib enters the corresponding first slideway under the action of the pre-tightening component.

In a further development of the belt buckle according to the invention, the switching mechanism can be designed to switch the buckle head from the unlocked state into the locked state by: the pressing part moves towards the sliding part under the action of the rack driven by the motor until the pressing part is contacted with the second tooth part, so that the second protruding rib of the sliding part is driven to move in the corresponding first slideway until the second critical point of the guide part is crossed by the second tooth part of the sliding part or the second critical point of the sliding part is crossed by the first tooth part of the guide part, and the second tooth part slides under the action of the pre-tightening part and is embedded in the corresponding first tooth part.

In one development of the belt buckle according to the invention, the first toothing may comprise a first bevel, a first vertical face and a second bevel, respectively, the slopes of which may have the same direction and magnitude, wherein the first inclined surface extends from the first edge of the first tooth part in a direction away from the guide member until intersecting one end of the first vertical surface, the boundary of the first inclined surface and the first vertical surface constitutes a first critical point, the second inclined surface extends from the second edge of the first tooth part toward the guide member until intersecting the other end of the first vertical surface, the second edge of the first tooth part constitutes a second critical point and the first vertical surface and the second inclined surface form a groove, and the second tooth part has a shape complementary to the groove, in the locked state, the second toothing engages in the corresponding recess under the action of the prestressing element. The switching between the unlocked state and the locked state can be easily achieved by the configuration of the inclined surface.

In a development of the belt lock according to the invention, the second toothing may comprise a third, a second, vertical and a fourth bevel, respectively, the slopes of which may have the same direction and magnitude, wherein the third bevel extends from the first edge of the second tooth portion in a direction away from the slip member until intersecting one end of the second vertical surface, the intersection of the third bevel and the second vertical surface constitutes a first critical point, the fourth bevel extends from the second edge of the second tooth portion toward the slip member until intersecting the other end of the second vertical surface, the second edge of the second tooth portion constitutes a second critical point and the fourth bevel of the second vertical surface forms a groove, and the first tooth portion has a shape complementary to the groove, in the locked state, the first toothing engages in the corresponding recess under the action of the prestressing element.

In a further development of the belt buckle according to the invention, at least one of the hold-down element, the guide element, the sliding element and the pretensioning element can be arranged coaxially with the buckle connection.

In a further development of the belt buckle according to the invention, the belt buckle can have an electrical device for detecting whether the buckle head is inserted by the belt tongue. When the electrical device recognizes that the locking head has been inserted by the belt tongue, the motor is driven in reverse to start the locking process.

In a further development of the belt buckle according to the invention, the motor can be operatively connected to the toothed rack via a first gear. Preferably, a second gear may be further provided between the first gear and the rack. The electric motor first transmits the torque to a second gearwheel, which is designed, for example, as a helical gearwheel, which then transmits the torque further to a first gearwheel, which is designed, for example, as a cylindrical gearwheel, and finally transmits the torque via the first gearwheel to the toothed rack, so that a conversion of the rotary motion of the electric motor into a linear motion of the toothed rack is achieved. Of course, the motor may be a linear motor to directly drive the rack to move linearly.

In a further development of the belt buckle according to the invention, the pretensioning element can be inserted fixedly into the buckle connection.

In a further development of the belt buckle according to the invention, the pretensioning element and the sliding element can have mutually repulsive magnetic properties, so that a pretensioning force is generated. Of course, the prestressing element can also be an elastic element, for example a helical spring, and always be in contact with the sliding element.

In a further development of the belt buckle according to the invention, the hold-down element can be integrally formed on the buckle connection. Further preferably, the hold-down member may be mounted on the latch attachment in a removable or non-removable manner.

In a further development of the belt buckle according to the invention, the toothed rack can be integrally formed on the end of the buckle connection. Preferably, the toothed rack can also be mounted on the end of the latching connection in a removable or non-removable manner.

In a further development of the belt buckle according to the invention, a hole can be formed centrally in the buckle connection, in which hole the buckle head is snapped by means of a steel wire. Furthermore, a steel wire may preferably be integrally formed at one end of the latching connection, which is connected to the latching head.

A second aspect of the invention relates to a vehicle having a seatbelt buckle according to the invention.

Drawings

The invention is explained in detail below by way of example with reference to the accompanying drawings by means of embodiments. These examples should not be construed as limiting the invention but as providing a better understanding thereof. Wherein:

fig. 1 shows a schematic perspective view of a seat belt buckle according to the invention;

FIG. 2 shows an exploded view of the seat belt buckle of FIG. 1;

FIG. 3 shows an enlarged detail view of a delivery device according to the present invention;

figure 4 shows a schematic view of a first embodiment of a switching mechanism according to the present invention;

FIG. 5 shows a schematic view of the switching mechanism of FIG. 4 in a locked state;

FIG. 6 shows a schematic view similar to FIG. 5;

fig. 7 shows a schematic view of the switching mechanism in fig. 6 in an unlocked state;

FIG. 8 shows a schematic view of the switching mechanism of FIG. 7 delivering the latch head in a delivery direction;

FIG. 9 shows a schematic view similar to FIG. 8;

FIG. 10 shows a schematic view of the switching mechanism of FIG. 9 at the beginning of the lockout;

FIG. 11 shows the switching mechanism of FIG. 10 again returning to the locked condition;

FIG. 12 shows a partially schematic view of the switching mechanism of FIG. 5 deployed in a circumferential direction;

FIG. 13 shows a view similar to FIG. 12 corresponding to FIG. 6;

FIG. 14 shows a view similar to FIG. 12 corresponding to FIG. 7;

FIG. 15 shows a view similar to FIG. 12 corresponding to FIG. 8;

FIG. 16 shows a view similar to FIG. 12 corresponding to FIG. 9;

FIG. 17 shows a view similar to FIG. 12 corresponding to FIG. 10;

FIG. 18 shows a view similar to FIG. 12 corresponding to FIG. 11;

fig. 19 shows a schematic view of a second embodiment of the switching mechanism according to the present invention.

Detailed Description

Fig. 1 shows a schematic perspective view of a belt buckle 1 according to the invention. Fig. 2 shows an exploded view of the belt buckle 1 from fig. 1. As can be seen from fig. 1 and 2, the belt buckle 1 comprises a buckle head 2 and a housing, not shown, which is held in the vehicle. The belt buckle 1 further comprises a delivery device for moving the buckle head 2 in a delivery direction X1 and a retraction direction X2 (see fig. 3).

Fig. 3 shows an enlarged detail view of a delivery device according to the invention. The delivery device comprises a cylindrical snap-lock connection 3 connected to the snap-lock head 2, preferably to the end of the snap-lock head. For example, a hole is formed centrally in the catch connection 3, in which the catch head 2 is snapped by means of a wire 12. The delivery device furthermore has a switching mechanism for switching the locking head 2 between the locked state and the unlocked state, a toothed rack 4 which is preferably fixedly connected to the locking connection 3, for example by means of a screw, and a motor 6 which is operatively connected to the toothed rack, for example by means of a first gear 5 and/or a second gear 11, the motor 6 being designed to move the toothed rack 4 linearly, so that the locking connection 3 with the locking head 2 can be moved in the delivery direction X1 and in the retraction direction X2. Preferably, the toothed rack 4 is integrally formed on the latching connection 3.

As can also be seen from fig. 3, the switching mechanism has a pressing member 7, a guide member 8, a sliding member 9, and a biasing member 10. In the present exemplary embodiment, the hold-down element 7, the guide element 8, the carriage element 9 and the prestressing element 10 are arranged coaxially with respect to the latching connection 3. The hold-down element 7 is arranged on the catch connection 3, and the guide element 8 is arranged on the housing and is configured here such that the catch connection 3 can be moved through with the hold-down element 7. A plurality of first runners 81 and a plurality of first projecting ribs 82 are alternately provided in the circumferential direction of the guide member 8 and the plurality of first projecting ribs 82 have first teeth 83 on the end portions close to the slip member 9, respectively. In correspondence with the guide part 8, a plurality of second slide channels 91 and a plurality of second projection ribs 92 are alternately provided in the circumferential direction of the runner part 9 and the plurality of second projection ribs 92 each have a second tooth 93 at an end close to the guide part 8, the runner part 9 being fitted over the latching connection 3 in a manner rotatable about and movable along the axis of the latching connection. The biasing element 10 is designed to bias the runner element 9 against the guide element 8.

The hold-down part 4 is in the present embodiment integrally formed on the snap connection 3. It goes without saying that the hold-down element 4 can also be mounted on the latching connection 3 in a detachable manner, for example by means of a threaded connection.

In the present exemplary embodiment, the pretensioning element 10 and the sliding element 9 have mutually repulsive magnetic properties, so that a pretensioning force is generated. It is of course also conceivable for the prestressing element 10 to be an elastic element and to be in constant contact with the sliding element 9.

In the locked state, the second toothing 93 engages with the first toothing 83 under the action of the prestressing element 10. In the unlocked state, the second projecting rib 92 can slide in the corresponding first slideway 81 and at the same time the second slideway 91 can be slid over by the corresponding first projecting rib 82. The hold-down element 7 interacts with the prestressing element 10 in such a way that the locking head 2 is switched between the locked state and the unlocked state.

Next, the operation principle of the switching mechanism will be described in more detail with reference to fig. 4 to 18.

Fig. 4 shows a schematic view of a first embodiment of the switching mechanism according to the invention, wherein the hold-down element and the pretensioning element are omitted. Each of the first teeth 83 includes a first slope 831, a first vertical plane 832 and a second slope 833, respectively, the slopes of which have the same direction and magnitude. The first ramp 831 extends from a first edge of the first toothing 83 in the direction away from the guide element 8 until it intersects one end of the first upright face 832, the boundary of the first ramp 831 with the first upright face 832 being formed as a first critical point a, the second ramp 833 extending from a second edge of the first toothing 83 toward the guide element 8 until it intersects the other end of the first upright face 832, the second edge of the first toothing 83 being formed as a second critical point B and the first and second upright faces 832, 833 forming a recess, while the second toothing 93 has a shape complementary to this recess, so that in the locked state the second toothing 93 engages in said recess under the action of the pretensioning element 10.

Fig. 5 to 18 illustrate the operating principle of the switching mechanism by way of example in the first embodiment of fig. 4, in which the hold-down element 7 is indicated by a dashed line, since its outer diameter is smaller than the inner diameter of the guide element in the present embodiment, i.e. the hold-down element can move completely through the guide element. Further, in this embodiment, the push-down member 7 has a third tooth 73 on an end portion close to the slip member 9. Fig. 12 to 18 show only schematically each two projecting ribs and each one runner of the guide part 8 and the runner part 9.

Fig. 5 shows a schematic view of the switching mechanism in fig. 4 in a locked state in which the push-down member is not in contact with the slip member. Fig. 12 shows a partially schematic view of the switching mechanism of fig. 5 deployed in the circumferential direction. As is clear from fig. 5 and 12, the second tooth 93 engages under the magnetic force of the pretensioning element 10 in the groove formed by the first vertical face 832 and the second inclined face 833 and the delivery function of the belt buckle 1 is not yet activated.

When the delivery function is activated, for example when a person is detected in the passenger seat, the safety belt buckle 1 needs to be unlocked first. At this time, the motor 6 is first driven to rotate reversely, so that the pressing member 7 is driven to move downward by the first gear 5, the second gear 11 and the rack 4 until the third tooth portion 73 contacts the second tooth portion 93, see fig. 6 and 13. Subsequently, the motor 6 continues to rotate reversely, the third tooth portion 73 and the second tooth portion 93 are always in contact under the magnetic force of the preloading member 10, the push-down member 7 drives the sliding member 9 to move away from the guide member 8 under the action of the rack 4 until the first critical point a of the guide member 8 is crossed by the second tooth portion 93 of the sliding member 9, and at this time, the belt buckle 1 is unlocked, as shown in fig. 7 and 14.

The delivery process is then started, i.e. the drive motor 6 is rotated forward, so that the hold-down member 7 is moved upward by the first gear 5, the second gear 11 and the rack 4. During this forward rotation of the motor, the inclined surfaces of the second teeth 93 first contact the first inclined surfaces 831 of the corresponding first teeth 83, and the push-down member 7 continues to move upward away from the slip member 9 by the rack 4. The second tooth 93 of the sliding part 9 slides under the magnetic force of the prestressing element 10 over the first tooth 83 into the corresponding first slideway 81, so that the second projecting ribs 92 of the sliding part 9 can be guided in the corresponding first slideway 81 of the guide element 8, see fig. 8 and 15. When the second tooth 93 of the sliding member 9 completely slides over the first tooth 83, the second tooth 93 is again held in contact with the third tooth 73 of the pressing member 7 by the magnetic force of the pretensioner member 10.

The motor 6 then continues to rotate in the forward direction until the maximum delivery stroke is reached, see fig. 9 and 16. When it is detected that the latch has been inserted, the latch starts to be retracted, and the driving motor 6 is rotated in reverse so that the push-down member 7 is moved downward by the first gear 5, the second gear 11 and the rack 4, and since the second tooth 93 is kept in contact with the third tooth 73 of the push-down member 7 by the magnetic force of the pretensioner member 10, the slide-rotating member 9 is also moved downward in the first slide 81 until the second critical point B of the guide member 8 is passed over by the second tooth 93 of the slide-rotating member 9 and the second tooth 93 is first engaged into the third tooth 73 of the push-down member 7 by the magnetic force of the pretensioner member 10, see fig. 10 and 17. Then, to lock the buckle head 2, the motor 6 is rotated forward again to move the hold-down member 7 upward until the inclined surfaces of the second teeth 93 contact the second inclined surfaces 833 of the corresponding first teeth 83 and the second teeth 93 disengage from the third teeth 73 of the hold-down member 7, and then the second teeth 93 engage with the corresponding first teeth 83 by the magnetic force of the pretensioner member 10 to lock the buckle head 2, see fig. 11 and 18.

Fig. 19 shows a schematic view of a second embodiment of the switching mechanism according to the invention, wherein the hold-down element and the prestressing element are likewise omitted. The second tooth 93 comprises a third inclined surface 931, a second vertical surface 932 and a fourth inclined surface 933, the slopes of the third inclined surface and the fourth inclined surface having the same direction and size, wherein the third inclined surface extends from the first edge of the second tooth in the direction away from the slip part 9 until intersecting one end of the second vertical surface 932, the boundary of the third inclined surface 931 and the second vertical surface 932 is configured as a first critical point a, the fourth inclined surface 933 extends from the second edge of the second tooth 93 toward the slip part 9 until intersecting the other end of the second vertical surface 932, the second edge of the second tooth 93 is configured as a second critical point B and the second vertical surface 932 and the fourth inclined surface 933 form a groove, and the first tooth 83 has a shape complementary to the groove, so that the first tooth 83 engages in the groove under the effect of the pretensioning part 10 in the locked state.

The features mentioned above can be combined with one another as desired, insofar as they are within the scope of the invention.

While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that these specific embodiments are merely illustrative. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principle of the present invention, and such changes and modifications fall within the scope of the present invention.

Claims

1. A belt buckle (1) for a vehicle belt system, the belt buckle comprising a buckle head (2) and a housing held in a vehicle, characterized in that:

the safety belt buckle further comprises a delivery device for moving the buckle head (2) in a delivery direction (X1) and a retraction direction (X2), the delivery device comprising a cylindrical buckle connection (3) connected to the buckle head (2), a switching mechanism for switching the buckle head (2) between a locked state and an unlocked state, a toothed rack (4) connected to the buckle connection (3), and a motor (6) operatively connected to the toothed rack, the motor (6) being configured to move the toothed rack (4) linearly, so as to be able to drive the buckle connection (3) together with the buckle head (2) in the delivery direction and the retraction direction,

wherein the switching mechanism has a hold-down part (7), a guide part (8), a runner part (9) and a prestressing part (10), the hold-down part (7) being arranged on the catch connection (3), the guide part (8) being arranged on the housing and being configured to be moved past by the catch connection (3) together with the hold-down part (7), a plurality of first ramps (81) and a plurality of first projection ribs (82) being arranged alternately in the circumferential direction of the guide part (8) and the plurality of first projection ribs (82) each having a first toothing (83) at an end close to the runner part (9), a plurality of second ramps (91) and a plurality of second projection ribs (92) being arranged alternately in the circumferential direction of the runner part (9) and the plurality of second projection ribs (92) each having a second toothing (93) at an end close to the guide part (8), the runner (9) is mounted on the latching connection in a manner that it can be rotated about the axis of the latching connection (3) and can be moved along the axis of the latching connection, the prestressing element (10) is designed to prestress the runner (9) against the guide element (8),

wherein the hold-down element (7) is designed to interact with the prestressing element (10) in such a way that the locking head (2) can be switched between a locked state, in which the second toothing (93) engages with the corresponding first toothing (83) under the effect of the prestressing element (10), and an unlocked state, in which the second projection rib (92) can slide in the corresponding first track (81) and at the same time the second track (91) can be slid over by the corresponding first projection rib (82).

2. The belt buckle (1) according to claim 1, characterized in that the switching mechanism is configured to switch the buckle head (2) from the locked state into the unlocked state by: the pressing part (7) moves towards the sliding part (9) under the action of the rack (4) driven by the motor (6) until the pressing part is in contact with the second tooth part (93), so that the sliding part (9) is driven to move away from the guide part (8) until the first critical point (A) of the guide part (8) is crossed by the second tooth part (93) of the sliding part (9) or the first critical point (A) of the sliding part (9) is crossed by the first tooth part (83) of the guide part (8), so that the second protruding rib (92) enters the corresponding first slide way (81) under the action of the pre-tightening part (10).

3. The belt buckle (1) according to claim 2, characterized in that the switching mechanism is configured for switching the buckle head (2) from the unlocked state into the locked state by: the pressing part (7) moves towards the sliding part (9) under the action of the rack (4) driven by the motor (6) until the pressing part is contacted with the second tooth part (93), so that the second protruding rib (92) of the sliding part (9) is driven to move in the corresponding first slide way (81), until the second critical point (B) of the guide part (8) is crossed by the second tooth part (93) of the sliding part (9) or the second critical point (B) of the sliding part (9) is crossed by the first tooth part (83) of the guide part (8), so that the second tooth part (93) slides under the action of the pre-tightening part (10) and is embedded in the corresponding first tooth part (83).

4. The belt buckle (1) according to one of claims 1 to 3, characterized in that the first toothing (83) comprises a first ramp (831), a first vertical face (832) and a second ramp (833), respectively, the slopes of which have the same direction and magnitude, wherein the first ramp (831) extends from a first edge of the first toothing (83) in a direction away from the guide part (8) until it intersects one end of the first vertical face (832), the intersection of the first ramp (831) with the first vertical face (832) is formed as a first critical point (A), the second ramp (833) extends from a second edge of the first toothing (83) toward the guide part (8) until it intersects the other end of the first vertical face (832), the second edge of the first toothing (83) is formed as a second critical point (B) and the first vertical face (832) forms a groove with the second ramp (833), the second toothing (93) has a complementary shape to the recess, so that in the locked state the second toothing (93) engages in the corresponding recess under the action of the prestressing element (10); or

The second teeth (93) respectively include a third slope (931), a second vertical surface (932) and a fourth slope (933), the slopes of the third slope and the fourth slope having the same direction and magnitude, wherein the third slope (931) extends from a first edge of the second teeth (93) in a direction away from the slip member (9) until intersecting with one end of the second vertical surface (932), the boundary of the third slope (931) and the second vertical surface (932) constitutes a first critical point (A), the fourth slope (933) extends from a second edge of the second teeth (93) toward the slip member (9) until intersecting with the other end of the second vertical surface (932), the second edge of the second teeth (93) constitutes a second critical point (B) and the second vertical surface (932) and the fourth slope (933) form a groove, and the first teeth (83) have a shape complementary to the groove, in the locked state, the first toothing (83) thus engages in the corresponding recess under the action of the prestressing element (10).

5. The safety belt buckle (1) as claimed in one of claims 1 to 3, characterized in that at least one of the hold-down element (7), the guide element (8), the sliding element (9) and the pretensioning element (10) is arranged coaxially with the buckle connection (3).

6. The belt buckle (1) according to claim 5, characterised in that the pretensioning element (10) is fixedly sleeved in the buckle connection (3).

7. The belt buckle (1) according to one of claims 1 to 3, characterized in that the belt buckle (1) has an electrical device for identifying whether a buckle head (2) is inserted by a belt tongue.

8. The safety-belt buckle (1) as claimed in one of claims 1 to 3, characterized in that the motor (6) is operatively connected to the toothed rack (4) via a first gear wheel (5).

9. The safety-belt buckle (1) as claimed in claim 8, characterized in that a second gearwheel (11) is also provided between the first gearwheel (5) and the toothed rack (4).

10. The belt buckle (1) according to one of claims 1 to 3, characterized in that the pretensioning element (10) and the sliding element (9) have mutually repulsive magnetic properties, so that a pretensioning force is generated, or the pretensioning element (10) is an elastic element and is always in contact with the sliding element (9).

11. The safety belt buckle (1) as claimed in one of claims 1 to 3, characterized in that the hold-down part (7) is integrally formed on the buckle connection (3) or the hold-down part (7) is mounted on the buckle connection (3) in a detachable or non-detachable manner.

12. The belt buckle (1) according to one of claims 1 to 3, characterized in that the toothed rack (4) is integrally formed on the end of the buckle connection (3) or the toothed rack (4) is mounted on the end of the buckle connection (3) in a detachable or non-detachable manner.

13. The safety belt buckle (1) as claimed in one of claims 1 to 3, characterized in that a hole is formed centrally on the buckle connection (3), in which hole the buckle head (2) is snapped in by means of a steel wire (12).

14. The safety belt buckle (1) as claimed in one of claims 1 to 3, characterized in that a steel wire (12) is integrally formed on one end of the buckle connection piece (3) and is connected to the buckle head (2).

15. Vehicle, characterized in that it has a belt buckle (1) according to any one of claims 1 to 14.